Safety-gearing for drills.



srlt'rils PATENT orrjcn.

DHA? O. FOSTER, OF PECULIAR. MISSOURI, ASSIGNOR OF ONE-THIRD TO .ABIA J.

^ SHARP, OYE HARRISONVILLE, MXSSOURI.

SAFET-Y-GEARING FOR DRILLS.

Specicticn cfLetters Patent.

Patented 900.2, H3.

Application med April 2, 191s. seriiaim. 758,330.

Tb all whom it may concern: Y

Llle it known that I., 'JOHN O, Fos/reu, a n oli the Unit-ed vStates,.a.nd a resident o. l cilliar, in the county of Cass and State of'l'issouri, have made certain new and "eful .improvements in safety-gearing for or ls el the type known es dropping-drills, unipr/se being toenable the drill when l by a cable and droppedsey to the hottoni of a `well-to make its stroke without slztmkjing. the gearing to such 'an extent as Ato -jco}' ia.rdire the safety of the-gearing. -A 1 As well known in the art of earth drilling;f and horing, holes in the earth arev frequently made by raising and dropping a drill ny aid-oi :l rope or' cable which is partifillv wound upon adrnm, and by aid of a Yspeeding lerer the cable slackened and the dril drops, makingr its stroke for the purposeol in-.ikng or deepening the hole in the-earth. y

In operating drills of the kind above mentioned-,- it is desirable to ,use a metallic cable in. connection with the drill-owingfto the greritlst-rength `afforded by -sucha cable. Since, however, a metallic cable. has but slight-exieneibility, the use ofl such a device 4-reqilently sets up dangerousstrainsdn the rearing eniployed for winding thezcable and i'fnnglheafu1.- c

What I scekto do, tlleret'ore, ie to provide cushioning mechanism interposed between relatively movable 'parts-of lthe Winding '.l fuzism, and so arranged that when thcopped, the shock upon the gear-ing led and the consequent damages ring-are reduced to a. minimum.

. rence is made to the accompanying drewmp; forming a part of th is specification,

.enclin which like letters indicate .like parts.,

Figure 1 a section through the winding shaft, the winding druinand the gearing l for actuating the drumf n on the line 2-2 of Fig. 1, looking in direction of the arrow. F ig. 3 is a detail sho in elevation the power disk h which power .is communicated to .ding shaft. Fig. 4 is a diagrammatic lowing the safety gearing as 32 u .on with the speeding lever the drill cable.

ipprted by hea-rings 4, 5, is

if? i3; secured rigidly upon ling druif? 7,. metallic :ted with this drum and Fig. 2 is a..

idol einI ers, and being connected with The drill 'vide a. number of spiral compression springs 15, and fit one end of each springr over one ofv the bosses 14, so that. each spring at one of its ends rests against the spring seat 13.

A power disk is shown at 16 'and is provided with a hub 17. This power disk is ribidly secured upon the winding shaft- 6 by aid of a key 18, and is provided with a number of lugs 19. These lugs are integral 'with the power disk 1G and extend laterally from it. Each lug 19 has a spring seat, and is provided with a boss 20 which extends into the adjacent end of a spring 15, as indicated in Fig. 2. A gear pinion 21 is mounted lrigidly upon a-Ldriving shaft 22 by aid of a key 22*al andis provided with teeth which mesh with the teeth of the gear 10.

- @speeding lever 23 is employed for actuatingr the cable in order to lift and drop the drill. The speeding lever is mounted upon a pivot. t.in 24 and carries a roller 2 5, the latter being in engagement with the cable. A revoluble crank arm 26 carries a pair of rollers 27 and as the crank arm is turned, in the direction indicated/by the arrow in Fig. 4, 'the speeding lever 23 is alternately pressed downwardly and released-its upward movement being comparatively abrupt owing to the close proximity of the rollers 27 to the pivot pin 24.

The operation of my device is as follows: The parts beingessembled and arranged as above described and the cable being connectd with a drill, the shaft 22 is turned in a clockwise direction according to Fig. 4 so as tolower the drill to the bottoni of a well 0r drill hole as the cese may be. This bcing done, the shaft 22 ,is secured 1n order to prevent it. from retrograding and the crank arm 26 is now rotated as above described. The rollers 27 are brought into engagement with the speeding; lever 23 'and the latter' is pressed downwardly and as the crank arm continues to turn the speeding lever is released. In this' manner the cable is alternately pulled upon and releasedthat is tightened and slackenedso that the drill is lifted and dropped continuously. Experience shows that the lifting and dropping of .the cable throws severe strain upon of vthe cable, and motion is transmitted through the shaft 6 and. disk 16 to the springs 15. Again, the sudden relaxation of the tension of the cable may cause the drum 'l to rock slightly and thus turn'the shaft 6 to a small extent in a contra-clock- WiseA direction according to Fig. 2. The springs 15 being under partial tension are free to become slightly elongated and in so doing they cushion the shock. In this inanner all injury to the gearing is prevented owing to the cushioning effect of the springs 15.

I do not. limit myself to the precisev construction shown as variations may be made `therein without departing from the spirit ofmy invention, the scope of which is coinmensurate withmy claims.

I claim; l l. The Acombination with a flexible inember for lifting and dropping a drill, aid a -speeding lever for pulling and releasin said flexible member, of. a drum for Win ing said .flexible member, gearing for turning said drum, and spring mechanism con' nected withsaid gearing for alleviating shocks otherwise transmitted from said flexible member through said drum to said gear- In a safety gearino for drills, the combination of a cable for ifting and dropping a drill and a speeding lever for pulling upon said cable and releasing the same in order to actuate ,safidcable, a drum upon which Said Acable is partially wound, a revoluble ping a drill, a speeding lever provided with a portion for engaging said cable in order to actuate the same, a revoluble drum con-- nected with said-cable for the purpose of winding the saine in order to raise and lower said drill, a shaft connected rigidly with said drum, a power diskmounted rigidly upon said shaft and provided with lu a` gear wheel loosely mounted upon said aft and provided with spring seats, springs engaging said spring seats 'of said gear wheel and also engaging said lugs of said power disk, and means for turning said gear wheel.

4. A device of the character described comprising acable for lifting and dropping a drill, a speeding lever provided with a' portion for engaging saidcable in order to actuafa the same, a drum connected with said'cr-ele and adapted to be turned for the purpose of winding and unwndin said cable, a shaft connected rigidly wit 'said drum, a power disk mounted ri 'dly upon` said shaft, a revoluble gear mein er located adjacent to said tions extendin said power dis r and means for vturning saidA gear;l member. v 5. The combination of a revoluble shaft,-

a. windinv drui'n mounted thereupon, amable connectedj with said'drum and adapted to be wound and unwound as said drum and said shaft are turned back and forth, 'a ear member loosely mounted upon said shat, a drivingimeinber secured rigidly uppn said- .shaft, springs connected with said gear memberjand with said driving member for transmitting rotary motion from' said. gear member to said driving member, and means for turning said gearvmember.

' JOHN O, FOSTER.

Witnesses:

Geo. P. KiMBERLIN, JOHN LAMAR. Jr.

power vdisk, spring connecw rom said gear member to". 

